What is the simple definition of Pure alum and impure alum for class 9?
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An alum (/ˈæləm/) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl(SO. 4) 2·12H. 2O, where X is a monovalent cation such as potassium or ammonium. By itself, "alum" often refers to potassium alum, with the formula KAl(SO.
Explanation:
Pure aluminium is obtained from bauxite, is relatively expensive to produce, and is too soft and weak to act as a structural material.
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